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Which Simple Machines Change The Direction Of Input Force?

pulley

: A simple machine that changes the direction of a force, often to lift a load.

Can a machine change the direction of the input force?

Machines make work easier by increasing the amount of force that is applied, increasing the distance over which the force is applied, or changing the direction in which the force is applied. … That’s because a machine doesn’t change the amount of work and work equals force times distance.

Does it change the direction of the input force?

The pulley can change the

direction of your input force. The pulley can decrease the amount of input force needed to lift the object. Types of Pulleys A fixed pulley has a single wheel that does not move. It changes the direction of the force but not the amount of force.

What machines change the direction of force?

A simple machine

is a mechanical device that changes the direction or magnitude of a force. In general, they can be defined as the simplest mechanisms that use mechanical advantage (also called leverage) to multiply force.

Does a screw change the direction of the force?

Lever: Moves around a pivot point to increase or decrease mechanical advantage. Inclined plane: Raises objects by moving up a slope. Screw: A device that can lift or hold things together. Pulley:

Changes the direction of a force

.

Is an axe a first class lever?

In this case, the ax blade divides the piece of wood into two parts. The leg below acts as a

third-class lever

. The force lies between the pivot point and the load. This muscle is called the triceps muscle.

What kind of lever is rake?

Lastly,

third-class levers

operate with the effort applied between the fulcrum and load. These levers can be found in tweezers, fishing rods, hammers, boat oars, and rakes.

What is the direction of the force?

The direction of the force is

in the direction opposite the object’s direction of motion

. The direction of the force is perpendicular to the direction the object moves. The object doesn’t move.

How do wedges change the direction of force?

The wedge is a simple machine whose use throughout history has been understated. It changes the direction of a downward force to a sideways force. As the hammer hits the wedge the downward force is changed to a sideways

force pushing the object that the wedge is embedded into sideways

.

How can you show the direction of a force?

Forces can be shown

using arrows

. The length of the arrow represents the size of the force, and the direction of the arrow shows the direction of the force.

Why are screws so strong?

Threaded fasteners are

strongest in tension (being pulled apart)

not in shear (slide apart). As a result, they prevent parts from sliding relative to each other by their clamp force not from the body of the fastener acting like a pin.

How do the directions of the input and output forces in a second class lever compare?

The mechanical advantage of a second-class lever is always greater than one. Therefore, second-class levers

multiply force

. In a second-class lever, the output force is between the fulcrum and the input force. In a third-class lever, the input force is located between the fulcrum and the output force.

How do screws hold things together?

Screws do one basic thing. They convert a force that goes around and around into a force that goes up and down. …

The up and down force generated by a screw

can also be used to hold things together. Screws can thread into a metal nut and the up and down force holds the two together.

Is a wheelbarrow a second class lever?

A wheelbarrow is a

second class lever

. Below is data from using a wheelbarrow to move a 30 kg rock. The effort (lift) is always applied at the end of the handles, 150 cm from the fulcrum. The fulcrum is where the wheelbarrow is joined to the axle of the wheel.

Is an AXE a third class lever?

The pickaxe is

a lever of the third kind

. When a pickaxe has to be used it is held with the hands, one hand is placed at the center of the handle to hold it there and the other is used to hold one end of the handle.

What are the examples of first class lever?

Other examples of first class levers are

pliers, scissors, a crow bar, a claw hammer, a see-saw and a weighing balance

. In summary, in a first class lever the effort (force) moves over a large distance to move the load a smaller distance, and the fulcrum is between the effort (force) and the load.

How Much A Machine Changes The Input Force Is Its What?

Mechanical advantage

is how much a machine changes the input force. 2. Mechanical advantage can be calculated as the ratio of the output force to the input force of a machine.

Can a machine change the input force?

Energy is still conserved for these devices because a machine cannot do more work than the energy put into it. However,

machines can reduce the input force

that is needed to perform the job. The ratio of output to input force magnitudes for any simple machine is called its mechanical advantage (MA).

How does a machine change input force and input work?

This force is called the input force. The input force moves the machine a certain distance, called the input distance. The machine, in turn,

does work by exerting a force on an object

. This is the output force.

What does a machine convert input do?

This force is called the input force. The input force moves the machine a certain distance, called the input distance. The machine, in turn, does work by

exerting a force on an object

. This is the output force.

What is the input of a machine?

Work input is

work done

on a machine to get the desired output. Work output is the amount of desired work that is done by a machine. For an ideal machine

What is the formula of input work?

In a pulley system without friction, work input equals work output: Work (in) = Work (out). … Work is determined by multiplying force by distance traveled:

Work (W) = Force (F)X Distance (d) W=Fd

. Write this equation down to use when you want to calculate work input in a pulley or a system of pulleys.

What is the difference between input work and input force?

Input force is the force that you exert on an object. Output force is the force the machine exerts on an object. … Input work is the

input force times (x) the input distance

. Output work is the output force times (x) the output distance.

Why is no machine 100% efficient?

Explanation: No machine is free from the effects of gravity, and even with wonderful lubrication, friction always exists. The energy a machine produces is always less than the energy put into it (energy input). … That is why 100% efficiency in machines

shall not be possible

.

How machines make our life easier?

But how do these machines help? Simple machines make our lives

easier by changing the amount of force or the direction of the force being applied (added)

. There are four simple machines that we use most often in our lives. An inclined plane is a slanted surface that helps to either lift up or lower an object.

How can you increase the work output of a machine?

The only way to increase the work output is

to increase the work input

. You can’t get more work out of a machine than you put into it. The moving parts of a machine must use some of the work input to overcome friction. Because of friction, the work output of a machine is always less than the work input.

What is input work example?

Examples of inputs include

labor (workers’ time), fuel, materials, buildings, and equipment

.

What is output of a machine?

In physics, work output is the work done by a simple machine, compound machine, or any type of engine model. In common terms, it is

the energy output

, which for simple machines is always less than the energy input, even though the forces may be drastically different.

Does machine multiply speed?

The mechanical advantage of a machine does one of two things: 1. Multiplies force (at the expense of distance/speed) 2. Multiplies distance/speed (at the expense of force) Page 15 The mechanical advantage of a machine is

the multiplier of the force or distance/speed

.

How do you calculate total energy input?

input energy refers to the

total energy supplied to a device

.

How do you find the input and output force?

The input force that you use on an inclined plane is the force with which you push or pull an object.

The output force is the force that you would need to lift the object without the

inclined plane. This force is equal to the weight of the object.

What is the definition of input distance?

The input distance is

the length of the sloped surface of the ramp

. This is the distance over which the input force is applied. The output distance is the height of the ramp, or the vertical distance the object is raised.

Is It Possible For A Machine To Have More Output Force Than Input Force?

What is the relationship between input work and output work? Since machines do not reduce the work you do, your

output work can never be greater than your input

work. How is it possible for output force to be greater than input force? The smaller input force must be applied over a greater distance.

When the output force is greater than the input force you have?

Increasing Force

: When the output force is greater than the input force, the mechanical advantage of a machine is greater than 1. Increasing Distance: When a machine increases distance, the output force is less than the input force.

Can the work output be greater than the work input?

Work output can never be greater than work input

. Machines allow force to be applied over a greater distance, which means that less force will be needed for the same amount of work.

How a simple machine is able to generate a greater output force than the input force?

Mechanical advantage is the ratio of output force divided by input force. If the output force is bigger than the input force, a machine has

a mechanical advantage greater

than one. … In machines that increase distance instead of force, the MA is the ratio of the output distance and input distance.

What machines have a greater output force than input force?

The ability of a

lever

to perform a task depends on its mechanical advantage. Mechanical advantage is the ratio of output force produced by a simple machine to the applied input force. The higher the output force in relation to the input force, the greater the mechanical advantage.

What are two examples of machines for which the output force is greater than the input force?

Mechanical Advantage and Type of Machine For machines that increase force — including

ramps, doorknobs, and nutcrackers

— the output force is greater than the input force. For machines that increase the distance over which force is applied, such as paddles and hammers, the output force is less than the input force.

What is the input force?

The input force that you use on an inclined plane is

the force with which you push or pull an object

. The output force is the force that you would need to lift the object without the inclined plane. This force is equal to the weight of the object.

Why is no machine 100% efficient?

A machine cannot be 100 percent efficient

because output of a machine is always less than input

. A certain amount of work done on a machine is lost to overcome friction and to lift some moving parts of the machine.

How much a machine changes the input force is its?

Mechanical advantage

is how much a machine changes the input force. 2. Mechanical advantage can be calculated as the ratio of the output force to the input force of a machine.

What is work output and input?

Work input is

work done on a machine to get the desired output

. Work output is the amount of desired work that is done by a machine.

Can energy output be greater than input?

Unsourced material may be challenged and removed. Since a machine does not contain a source of energy, nor can it store energy, from conservation of energy the power output of

a machine can never be greater than its input

, so the efficiency can never be greater than 1.

Why is the work output for a machine always less than the work input?

Although nearly equal, the output work is less than the input work

because of friction

. All machines use some amount of input work to overcome friction. The only way to increase the work output is to increase the amount of work you put into the machine. You cannot get more work out of a machine than you put into it!

When work is done work output?

In physics, work output is the work done by a simple machine, compound machine, or any type of engine model. In common terms, it is the

energy output

, which for simple machines is always less than the energy input, even though the forces may be drastically different.

How do you calculate input and output work?

Write down the law of work input and work output. In a pulley system without friction,

work input equals

work output: Work (in) = Work (out). Attach a known mass to the other end of the cord. It will be necessary to determine force when you want to calculate the work input in a pulley or a system of pulleys.

Are scissors a class 1 lever?

Other examples of

first class levers

are pliers, scissors, a crow bar, a claw hammer, a see-saw and a weighing balance. In summary, in a first class lever the effort (force) moves over a large distance to move the load a smaller distance, and the fulcrum is between the effort (force) and the load.

What Is An Example Of A Force Multiplier?

Some examples of force multipliers are

inclined planes and most levers

. Speed multipliers are devices that increase the speed of, or distance travelled by, an object. … Some examples are wheels and axles and third class levers.

Is a banana a force multiplier?

You attacked somebody with a banana.” Bob: “A banana, force multiplier.” Calvin: “What?” Bob: “Well, basically what that means is anything in your hand is far more dangerous than just your bare hands alone, including a banana.”

What acts as a force multiplier?

Force Multipliers are tools that help you Amplify your effort to produce more output.

A hammer

is a force multiplier.

What is a force multiplier give three examples of force multipliers?

Machines with an MA greater than 1 are said to be “force multipliers”.

Hammers, wheel barrows, spanners and car jacks

are examples of “force multipliers levers”. Axle and wheels, some gear systems and multiple pulley systems are also “force multipliers”.

Are Guns force multipliers?

The military has long recognized that

machine guns are force multipliers for rifles

, but businesses have been slow to capitalize on this concept.

What is another word for force multiplier?

force amplifier force increaser	force magnifier combat multiplier	strength multiplier catalyst

What does force multiplier do wow?

Force Multiplier

Permanently

enchant a weapon to occasionally increase Strength or Agility by 264 and Mastery, Haste, or Critical Strike by 170 for 15 seconds

. Your highest stat is always chosen.

What is force multiplier in military?

In military science, a force multiplication or force multiplier is

a factor (or several factors) that gives personnel or hardware the ability to accomplish greater feats than without it

. The expected size increase required to have the same effectiveness without that factor is the multiplication factor.

What is an example of a speed multiplier?

Speed multipliers are devices that increase the speed of, or distance travelled by, an object. … Speed multipliers are useful when an object needs to move a further distance or at a higher speed. Some examples are

wheels and axles and third class levers

.

How do you use force multiplier in a sentence?

It is

a great

force multiplier. I hope that he will recognise the importance of helicopters as a force multiplier, especially in an army which is smaller than we would like it to be. Officer and pilot comments included definitely was a force multiplier.

What is the difference between a force multiplier and a distance multiplier?

Levers can be force multipliers, when they increase the force that is put in (the effort). They can be distance multipliers

if they make the load move further than the effort

. The amount the force or distance is multiplied depends on the distances between the load and the pivot, and the effort and the pivot.

Is a screw a force multiplier?

Like the other simple machines a

screw can amplify force

; a small rotational force (torque) on the shaft can exert a large axial force on a load. The smaller the pitch (the distance between the screw’s threads), the greater the mechanical advantage (the ratio of output to input force).

Is scissors a force multiplier?

A scissor is a

force multiplier

because the effort applied is less than the load.

What is the disadvantage of force multipliers?

Force multiplier technologies such as the AWACS and air refuellers are vulnerable and as their presence is a force multiplier, the loss of

even one of those can severely degrade combat capability

. This needs to be factored in during planning for operations.

Why is a lever called a force multiplier?

Simple levers and rotation

As effort is applied to rotate one end about the pivot. … Levers, such as this one, make use of moments to act as a force multiplier . They

allow a larger force to act upon the load than is supplied by the effort

, so it is easier to move large or heavy objects.

What Is The Force Applied To A Simple Machine Called?

When you use a machine, you apply force to the machine. This force is called

the input force

. The machine, in turn, applies force to an object. This force is called the output force.

What is the force exerted by a machine called?

The force exerted by a machine is called

the output force

. The distance the output force is exerted through is the output distance. The work output of a machine is the output force multiplied by the output distance.

What is force simple machines?

simple machine, any of several devices with few or no moving parts that are used to modify motion and the

magnitude

of a force in order to perform work. … The simple machines are the inclined plane, lever, wedge, wheel and axle, pulley, and screw.

When a machine is used to do work the force applied by the machine is called the effort force?

Two forces are involved when a machine is used to do work. The force that is applied to the machine is called

the input force

. stands for the effort force. when you use a machine—the work done by you on the machine and the work done by the machine.

What is input force also called?

• Input force (also called

the effort

) – the force applied to the lever.

Is a crank a simple machine?

Simple machines are devices that can be used to multiply or augment a force that we apply – often at the expense of a distance through which we have to apply the force. A few simple machines are the lever, nail puller, wheelbarrow, crank, etc.

What two simple machines make up the AXE?

An axe consists of

a wedge at the end of a lever arm

.

Why is no machine 100% efficient?

What is the force between two charged bodies called?

The Coulomb force

between two or more charged bodies is the force between them due to Coulomb’s law. … This called Coulomb’s law and was the first attempt to understand the electric force. Like the gravitational force, the Coulomb force is an inverse square law.

What is the force acting on a unit area called?

pressure

. … The force acting on a unit area of a surface is called pressure.

How Machines make our life easier?

There are three ways simple machines make work easier:

by increasing the distance through which force is applied

, by changing the direction of applied force, or by multiplying force of speed of the energy applied.

What are 1st 2nd and 3rd class levers?

–

First class levers have the fulcrum in the middle

. – Second class levers have the load in the middle. – This means a large load can be moved with relatively low effort. – Third class levers have the effort in the middle.

Is tweezers a third class lever?

A Pair of tweezers is also an example of a

Third Class lever

. The force is applied in the middle of the tweezers which causes a force at the tips of the tweezers. The fulcrum is where the two halves of the tweezers are joined together.

What are 3 types of levers?

First class lever – the fulcrum is in the middle of the effort and the load.
Second class lever – the load is in the middle between the fulcrum and the effort.
Third class lever – the effort is in the middle between the fulcrum and the load.

What is lever and its types?

There are three types or classes of levers, where load and effort are located in relation to the fulcrum. The first-class levers are an integer between effort and load. The

second-class levers are loaded between effort and fulcrum

. And the third-class levers are between load and fulcrum.

Which class of lever is most efficient?

First- and second-class levers

generally are very efficient, especially when the loads are located close to the fulcrum while efforts are further from the fulcrum (Figures A and C). The efficiency of first- and second-class levers will decrease when loads move further from the fulcrum (Figures B and D).

What Is The Difference Between Input And Output Force?

The input force that you use on an inclined plane is the force with which you push or pull an object. The output force is the

force that you would need to lift the object without

the inclined plane.

What is the difference between input and output work?

Work input is work done on a machine to get the

desired output

. Work output is the amount of desired work that is done by a machine.

What is the difference in input force and output force in a simple machine?

The difference between the two is very simple to understand:

Input Force represents the amount of force that you put into another object

. Output Force represents the force that a specific object has as a result of the input force.

What is the difference between input work and input force?

Answer: Input work is the work done on a machine as the input force acts

through the input distance

. Other ways it would be the work done on a body or system, that is, forces that are applied to the body or system. … The machine does to the object to increase the output distance.

What is the meaning of output force?

Output force is

the force exerted on an object by a simple machine

.

What is input and output distance?

How do you calculate input and output work?

The work efficiency formula is

efficiency = output / input

, and you can multiply the result by 100 to get work efficiency as a percentage. This is used across different methods of measuring energy and work, whether it’s energy production or machine efficiency.

What is the input force?

Why is work output less than work input?

What is the formula of output work?

The formula calculating work output is

F*D/T

, where F is the force exerted, D is the distance and T is the time. The work output of a system is also described as its Power. In order for work to be done, force has to be applied in the direction of the motion.

When work is done work output?

What is the input and output physics?

Input refers to the amount of energy put into a device, and output refers to the amount of energy that comes out

. A device may change the type of energy but not the amount. For example, a light bulb’s input energy is the form of electrical energy, and its output energy is in the form of light and heat.

Can you make the work output of a machine greater than the work input?

What is output distance?

What is the definition for output distance?

The distance an output force acts through in a machine

. What is the definition for work output? The work done by a machine as the output force acts through the output distance. … The ratio of the output force to the input force in a machine.

What’s the difference between input and input?

“

Imput

” is a commonly misused spelling and pronunciation of the word “input.” “Input” refers to the act of putting something in, most commonly concerning a data process or other function. … “Imput” is not a word, despite what many think to the contrary.

What Is The Load Of A Lever?

The object that is lifted on the other end

is called the load. There are three parts to all levers: • Fulcrum – the point at which the lever rotates. Input force (also called the effort) – the force applied to the lever. Output force (also called the load) – the force applied by the lever to move the load.

What is load and effort?

Load is

a heavy or a bulky object that requires effort to move or lift the load

. Effort is an applied force to bring desired change to the position (push or lift) of the load.

What is the load in a lever called?

The object being moved by the lever is often called the load,

or output force

, while the force applied to the lever is called the effort, or input force. The crowbar is a classic example of how the lever is employed to do work easier.

What is the load arm of a lever?

The lever has two “arms”: The load arm (or output arm) is

the por- tion of the lever directly connected to the load

. The effort arm (or arm of applied force) is the portion of the lever to which we apply the effort, or input force.

How do you find the load of a lever?

Measure the distances between the fulcrum, or balance point of a lever and each end.

Divide the length of the lever’s effort arm by the length of its resistance arm

. According to Utah State University, the effort arm is the input force and the resistance arm is the output force.

What are 1st 2nd and 3rd class levers?

What are 3 types of levers?

First class lever – the fulcrum is in the middle of the effort and the load.
Second class lever – the load is in the middle between the fulcrum and the effort.
Third class lever – the effort is in the middle between the fulcrum and the load.

What is difference between effort and load?

As nouns the difference between load and effort

is that load is

a burden

; a weight to be carried while effort is the work involved in performing an activity; exertion.

What is an example of effort?

Effort is defined as the use of physical or mental energy, the act or result of trying to do something. An example of effort is

someone using their brain to make a plan

. An example of effort is writing a letter.

What is difference between force and load?

Force is a measure of the interaction between bodies. … Force is known as a vector quantity, as it has both direction and magnitude. Load. Load is a term frequently used in engineering to mean the force exerted on a surface or body.

What is a class 2 lever examples?

A wheelbarrow, a bottle opener, and an oar

are examples of second class levers.

What is a class 3 lever examples?

With third class levers the effort is between the load and the fulcrum, for example in

barbecue tongs

. Other examples of third class levers are a broom, a fishing rod and a woomera.

What is the formula for load arm?

ii) MA of lever = Effort Arm

/ Load Arm = EA /LA

.

In this case, we need to measure the effort arm length (fulcrum to effort distance) and the load arm length (fulcrum to load distance).

How do you get a lever arm?

The lever arm is the

perpendicular distance from the axis of rotation to the line of action of the force

. and the magnitude of the torque is τ = N m. The direction of the torque associated with the illustration above is toward you. That is, it is along the rotation axis in the direction out of the screen.

What is the formula of effort?

The effort distance (also sometimes called the “effort arm”) is shorter than the resistance distance.

Mechanical advantage = |Fr/Fe | where |

means “absolute value.” Mechanical advantage is always positive.

How do you calculate load?

Calculating an Electrical Load in a Simple Circuit

Let Power = Voltage * Current (P=VI)

. Let Current = Voltage/Resistance (I=V/R). Apply Kirchoff’s Second Law, that the sum of the voltages around a circuit is zero. Conclude that the load voltage around the simple circuit must be 9 volts.

Does It Change The Direction Of The Input Force?

Does it change the direction of the input force?

The pulley can change the direction of your input force

. The pulley can decrease the amount of input force needed to lift the object. Types of Pulleys A fixed pulley has a single wheel that does not move. It changes the direction of the force but not the amount of force.

Does a lever change the direction of your input force?

When force (effort) is applied to one side of the lever, the load moves in the opposite direction. In other words,

first-class levers change the direction of the input force

.

What does force input mean?

The input force is

the force you apply to the machine

, and the output force is the force the machine applies to the object you are trying to move. A machine can be arranged to generate a large output force from a small input force.

Does a wheel and axle change the direction of the input force?

What is the input motion and force?

The input part of the system is

any type of motion and force that drives the mechanical system

. The input motion and force may be from any power source including human effort, energy from the wind, water, heat etc., from a chemical reaction or from an electrical, pneumatic or hydraulic device.

What does a lever change?

When the input and output forces are on opposite sides of the fulcrum, the lever changes

the direction of the applied force

. This occurs only with first-class levers. When both the input and output forces are on the same side of the fulcrum, the direction of the applied force does not change.

Which class of lever does not change the direction of the applied force?

Examples of

third-class

levers include tweezers, hammers, and shovels. A third-class lever does not change the direction of force; third-class levers always produce a gain in speed and distance and a corresponding decrease in force.

What does input and output force mean?

The input force that you use on an inclined plane is the force with which you push or pull an object. The output force is the force that you would need to lift the object without the inclined plane

.

How do you find the input force?

What is an input force quizlet?

What Is Input Force?

the force you put on the machine

.

How does a wheel and axle affect force?

The wheel and axle simple machine is closely related to gears. Like all other simple machines the wheel and axle system changes the force

by changing the distance over which the force must be applied

; if the input force is reduced to the output force, then the force must be applied over five times the distance.

How does a pulley change the direction of force?

True, A fixed pulley changes the direction of the force you exert

by pulling

, so you can pull down to move an object up. In this fixed pulley system, you pull down on one side of the rope and the other side goes up. You use the same amount of force to pull down as you would to lift the toy yourself.

Does the axle move with the wheel?

A wheel with a rod, called an axle, through its center:

both parts move together

to help us move a heavy load with less effort.

Does the input force equal the output force?

The ratio of output force to input force is the mechanical advantage of a machine

. Increasing Force: When the output force is greater than the input force, the mechanical advantage of a machine is greater than 1. Increasing Distance: When a machine increases distance, the output force is less than the input force.

How do simple machines change the direction of force?

Simple machines

use a pivot point such as a lever fulcrum or axle bearing to provide a “counteractive” force to combine with the applied force(s) to produce a resultant force

, acting in a different direction and/or with a different magnitude to that applied.

How do you find the input force and output force?

Does a lever increase force?

Levers increase the force by decreasing the distance

.

What forces are acting with a lever?

How do the directions of the input and output forces in a second class lever compare?

In which class of lever is the output force between the fulcrum and input force?

In a

second class lever

, the output force is between the fulcrum and the input force.

In what order of lever is the output force between the input force and fulcrum?

First-class levers always have the fulcrum between the input force and the output force.

Second class levers

always have the output force between the fulcrum and the input force. Third class levers always have the input force between the fulcrum and the output force.

What are the 3 different classes of levers?

First class lever – the fulcrum is in the middle of the effort and the load.
Second class lever – the load is in the middle between the fulcrum and the effort.
Third class lever – the effort is in the middle between the fulcrum and the load.

What’s the difference between input and input?

What is it called when a force produces motion in the direction of the force?

work. when a force produces motion in the direction of the force.

What happens to the input distance when the input force decreases?

Tire jack Lug wrench Rowing oar Summary: As input force decreases,

the input distance increases

.

How do inputs work?

Work is determined by multiplying force by distance traveled:

Work (W) = Force (F)X Distance (d) W=Fd

. Write this equation down to use when you want to calculate work input in a pulley or a system of pulleys.

How much a machine changes the input force is its?

How do you find the input force of a lever?

What is output force in physics?

What is the definition of input distance?

What is another name for the output force?

A B	output force another name for resistance force	efficiency measure of how much of the work put into a machine is changed into useful work	ideal machine fictional machine in which no friction or gravity affects occur	lever bar that is free to pivot about a fixed point

What changes the direction of the force?

What effect of a force does a lever show?

This has the effect of

rotating or lifting the load

. Levers, such as this one, make use of moments to act as a force multiplier . They allow a larger force to act upon the load than is supplied by the effort, so it is easier to move large or heavy objects.

What machine changes the direction of force?

A pulley

changes the direction in which force is applied. A pulley changes the direction in which force is applied.

Why do we use a lever?

A lever

enables people to do work using less force

. A lever usually is used to move or lift objects. Sometimes it is used to push against objects, but not actually move them. Levers can be used to exert a large force over a small distance at one end by exerting only a small force over a greater distance at the other.